TW202212192A - Bicycle hydraulic assembly and bicycle braking device - Google Patents

Abstract

A bicycle hydraulic assembly includes a housing, a first piston and a second piston. The housing has a chamber, an inlet channel and an outlet channel. The inlet channel and the outlet channel are connected to the chamber. The first piston is movably located in the chamber. The second piston is movably located in the chamber and sleeved on the first piston. The second piston has a first end portion and a second end portion opposite to each other. An outer diameter of the first end portion is larger than an outer diameter of the second end portion. The second end portion is located farther away from the inlet channel than the first end portion. When the first piston is moved a distance smaller than a threshold by oil, the second piston is not moved with respect to the housing, and the first piston is moved with respect to the second piston. When the first piston is moved a distance larger than the threshold by oil, the first piston moves the second piston with respect to the housing.

Description

Bicycle hydraulic components and bicycle brakes

The present invention relates to a hydraulic assembly and a braking device, in particular to a hydraulic assembly of a bicycle and a braking device of the bicycle.

In recent years, the bicycle market has developed vigorously. Whether it is a high-end competition bicycle or a popular bicycle as a means of transportation and leisure entertainment, it is loved by consumers, prompting manufacturers to pay more attention to the needs of users for bicycle functions. The body material and equipment function are constantly improved and refined, but the current bicycle still needs to be improved.

In the case of bicycle braking, the brake lever is used to actuate the brake caliper through hydraulic oil, and the brake caliper is used to clamp the brake disc fixed to the wheel. When the brake handle is pressed, the piston in the brake handle is driven to move to push the hydraulic oil, and then the hydraulic oil will actuate the brake caliper, so that the brake caliper clamps the brake disc to brake the wheel. However, at present, the hydraulic pressure generated by the hydraulic oil pushed by the piston of the brake lever is insufficient, so that the braking force of the brake caliper on the wheel is insufficient. Therefore, researchers in this industry are currently working on improving the aforementioned problems.

The present invention is to provide a bicycle hydraulic assembly and a bicycle brake device, so as to solve the problem of insufficient hydraulic pressure caused by the piston of the brake handle pushing the hydraulic oil in the prior art.

An embodiment of the present invention discloses a hydraulic component of a bicycle including a casing, a first piston and a second piston. The casing has a hydraulic chamber, an oil inlet channel and an oil outlet channel, and the oil inlet channel and the oil outlet channel are connected to the hydraulic chamber. The first piston is movably located in the hydraulic chamber. The second piston is movably located in the hydraulic chamber and sleeved on the first piston, and the second piston has a first end portion and a second end portion opposite to each other, and the outer diameter of the first end portion is larger than that of the second end portion. Outer diameter, the second end is farther from the oil inlet channel than the first end. When the distance that the first piston is pushed by the hydraulic oil is less than a critical distance, the second piston is stationary relative to the housing, and the first piston moves relative to the second piston; when the distance that the first piston is pushed by the hydraulic oil is greater than the critical distance, The first piston drives the second piston to move relative to the housing together.

Another embodiment of the present invention discloses a bicycle brake device for accommodating a hydraulic oil, including a brake handle and a hydraulic component. The brake lever has an oil outlet. The hydraulic assembly is provided on the brake handle. The hydraulic assembly includes a casing, a first piston and a second piston. The housing has a hydraulic chamber, an oil inlet channel and an oil outlet channel. The oil inlet channel and the oil outlet channel are connected to the hydraulic chamber, and the oil inlet channel is connected to the oil outlet hole of the brake handle. The first piston is movably located in the hydraulic chamber. The second piston is movably located in the hydraulic chamber and sleeved on the first piston, and the second piston has a first end portion and a second end portion opposite to each other, and the outer diameter of the first end portion is larger than that of the second end portion. Outer diameter, the second end is farther from the oil inlet channel than the first end. When the distance that the first piston is pushed by the hydraulic oil is less than a critical distance, the second piston is stationary relative to the housing, and the first piston moves relative to the second piston; when the distance that the first piston is pushed by the hydraulic oil is greater than the critical distance, The first piston drives the second piston to move relative to the housing together.

Another embodiment of the present invention discloses a bicycle brake device for accommodating a hydraulic oil, including a brake caliper and a hydraulic assembly. The brake caliper has an oil inlet. The hydraulic components are arranged on the brake calipers. The hydraulic assembly includes a casing, a first piston and a second piston. The housing has a hydraulic chamber, an oil inlet channel and an oil outlet channel. The oil inlet channel and the oil outlet channel are connected to the hydraulic chamber, and the oil outlet channel is connected to the oil inlet hole of the brake caliper. The first piston is movably located in the hydraulic chamber. The second piston is movably located in the hydraulic chamber and sleeved on the first piston, and the second piston has a first end portion and a second end portion opposite to each other, and the outer diameter of the first end portion is larger than that of the second end portion. Outer diameter, the second end is farther from the oil inlet channel than the first end. When the distance that the first piston is pushed by the hydraulic oil is less than a critical distance, the second piston is stationary relative to the housing, and the first piston moves relative to the second piston; when the distance that the first piston is pushed by the hydraulic oil is greater than the critical distance, The first piston drives the second piston to move relative to the housing together.

According to the hydraulic components of the bicycle and the brake device of the bicycle disclosed in the above embodiments, the outer diameter of the first end of the second piston is larger than the outer diameter of the second end, and the distance that the first piston is pushed by the hydraulic oil is larger than The setting of driving the second piston to move relative to the casing after the critical distance can make the pressure of the hydraulic oil flowing out of the oil outlet channel have the effect of amplifying, thus increasing the force of the brake caliper for wheel braking.

The above description of the content of the present invention and the description of the following embodiments are used to demonstrate and explain the principle of the present invention, and provide further explanation of the scope of the patent application of the present invention.

See Figures 1 through 3. FIG. 1 is a schematic perspective view of a hydraulic assembly of a bicycle disclosed according to a first embodiment of the present invention. FIG. 2 is an exploded schematic view of FIG. 1 . FIG. 3 is a schematic cross-sectional view of FIG. 1 .

In this embodiment, the hydraulic assembly 1 of the bicycle is used to accommodate a hydraulic oil (not shown). The hydraulic assembly 1 includes a casing 10 , a first piston 20 and a second piston 30 . In this embodiment, the hydraulic assembly 1 of the bicycle may further include a magnet 40 and an elastic member 50 .

The casing 10 has a hydraulic chamber 11 , an oil inlet channel 12 and an oil outlet channel 13 . Specifically, the casing 10 includes a first casing portion 14 and a second casing portion 15 in a set. The hydraulic chamber 11 and the oil outlet passage 13 are located in the first casing portion 14 , and the oil inlet passage 12 is located in the second casing portion 15 . The hydraulic chamber 11 has a first chamber 111 and a second chamber 112 connected thereto. The width W1 of the first chamber 111 is greater than the width W2 of the second chamber 112 . The first chamber 111 is closer to the oil inlet passage 12 than the second chamber 112 , and the oil inlet passage 12 and the oil outlet passage 13 are respectively connected to the first chamber 111 and the second chamber 112 . In this embodiment, the oil inlet passage 12 is connected to the brake handle (not shown) of the bicycle, for example, through an oil pipe (not shown), and the oil outlet passage 13 is connected to the brake caliper (not shown) of the bicycle, for example, through an oil pipe (not shown). not shown).

The first piston 20 is movably located in the hydraulic chamber 11 , and different parts of the first piston 20 are respectively located in the first chamber 111 and the second chamber 112 of the hydraulic chamber 11 . Specifically, the first piston 20 includes a head portion 21 and a body portion 22 which are connected together. The head 21 of the first piston 20 is located in the first chamber 111 , and the body 22 extends from the first chamber 111 and the second chamber 112 .

The second piston 30 is movably located in the hydraulic chamber 11 , and different parts of the second piston 30 are respectively located in the first chamber 111 and the second chamber 112 of the hydraulic chamber 11 . The second piston 30 has a first end portion 31 , a second end portion 32 and a through groove 33 . The outer diameter D1 of the first end portion 31 of the second piston 30 is larger than the outer diameter D2 of the second end portion 32 , and the first end portion 31 and the second end portion 32 of the second piston 30 are located in the first chamber 111 and the second end portion 32 respectively. The second chamber 112 . The second piston 30 is sleeved on the body 22 of the first piston 20 through the through groove 33 . In this embodiment, the through groove 33 of the second piston 30 has a wide part 331 and a narrow part 332 connected to each other, and the wide part 331 of the through groove 33 is closer to the oil inlet channel 12 than the narrow part 332 . The width W3 of the wide portion 331 is greater than the width W4 of the narrow portion 332 , and a differential surface 333 is formed between the wide portion 331 and the narrow portion 332 . The width W5 of the head portion 21 of the first piston 20 is smaller than the width W3 of the wide portion 331 of the through-slot 33 and greater than the width W4 of the narrow portion 332 of the through-slot 33 , and the width W6 of the body 22 of the first piston 20 is smaller than the width W6 of the through-slot 33 The width W4 of the narrow portion 332. The body portion 22 of the first piston 20 is partially located in the narrow portion 332 of the through groove 33 , and the step surface 333 is farther from the oil inlet passage 12 than the head portion 21 of the first piston 20 .

In this embodiment, the magnet 40 is disposed in the first chamber 111 and is located on the side of the head 21 of the first piston 20 away from the step surface 333 . The magnet 40 has a through hole 41 , and the through hole 41 is aligned with the oil inlet passage 12 and communicated with the oil inlet passage 12 . The first piston 20 is, for example, an iron material, and the magnet 40 is used to apply a magnetic attraction force to the head 21 of the first piston 20 to move away from the step surface 333 .

In this embodiment, the head 21 of the first piston 20 has a top surface 211 , an outer ring surface 212 and a plurality of grooves 213 . The top surface 211 of the first piston 20 faces the magnet 40 , the outer ring surface 212 of the first piston 20 is connected to the top surface 211 , the grooves 213 extend from the top surface 211 to the outer ring surface 212 , and one end of the grooves 213 is connected to each other , and the other ends of these grooves 213 communicate with the wide portion 331 of the through grooves 33 .

In this embodiment, the number of the grooves 213 is not limited to a plurality. In other embodiments, the first piston may have only one groove.

The elastic member 50 is, for example, a spring. The elastic member 50 is located in the first chamber 111 and is sleeved on the second piston 30 . The two opposite ends of the elastic member 50 press against the first end 31 of the second piston 30 and the differential surface 113 between the first chamber 111 and the second chamber 112 respectively. The elastic member 50 is used to apply a force for the second piston 30 to move toward the oil inlet passage 12 .

As shown in FIG. 3 , when the first piston 20 is at an initial position P, the top surface 211 of the first piston 20 abuts against the magnet 40 , and the head 21 of the first piston 20 and the through groove 33 of the second piston 30 enter The step surface 333 of the first piston 20 maintains a distance, so the oil inlet passage 12 communicates with the oil outlet passage 13 through the through hole 41 of the magnet 40 , the groove 213 of the first piston 20 , the through groove 33 and the second chamber 112 . At this time, pressing the brake handle, the brake handle will force the hydraulic oil to pass through the oil pipe, the oil inlet channel 12, the through hole 41 of the magnet 40, the groove 213 of the first piston 20, the through groove 33, the second chamber 112, and the oil outlet channel 13 and another oil pipe flow to the brake caliper, so that the piston of the brake caliper pushes to make the pad clamp the brake disc (not shown).

When the brake pads of the brake caliper clamp the brake disc, the hydraulic oil can no longer force the piston of the brake caliper to continue to push the pads, so the pressure of the hydraulic oil cannot be vented, resulting in the hydraulic chamber 11 of the housing 10 . The pressure of the hydraulic oil continues to increase, so that the hydraulic oil pushes the first piston 20 to move relative to the housing 10 .

Next, please refer to FIG. 4 , which is a schematic cross-sectional view of the first piston of FIG. 1 when the moving distance is less than the critical distance. When the distance T1 that the first piston 20 is pushed by the hydraulic oil from the initial position P is smaller than a critical distance T, the second piston 30 is stationary relative to the housing 10 and the first piston 20 moves relative to the second piston 30 . At this time, although the head 21 of the first piston 20 enters the wide portion 331 of the through groove 33 , the head 21 of the first piston 20 still keeps a distance from the step surface 333 , so the oil inlet passage 12 still passes through the through groove 33 and the step surface 333 . The second chamber 112 communicates with each other.

Next, please refer to FIG. 5 and FIG. 6 . 5 is a schematic cross-sectional view of the first piston of FIG. 1 when the moving distance is equal to the critical distance, and FIG. 6 is a cross-sectional schematic view of the first piston of FIG. 1 when the moving distance is greater than the critical distance.

As shown in FIG. 5 , when the distance T2 that the first piston 20 is pushed by the hydraulic oil from the initial position P is equal to the critical distance T, the head 21 of the first piston 20 abuts against the step surface 333 to block the penetration groove 33 , so that the penetration groove 33 is blocked. The oil passage 12 and the second chamber 112 are not in communication. In such a state, the first piston 20 and the second piston 30 can be regarded as an integral piston 60 . At this time, the hydraulic oil in the first chamber 111 is still pressurized continuously, so the hydraulic oil in the first chamber 111 continues to push the first piston 20, and the distance that the first piston 20 moves from the initial position P starts to be greater than the critical value distance T, and at the same time, the first piston 20 starts to drive the second piston 30 to move relative to the housing 10 , so that the second piston 30 compresses the elastic member 50 .

As shown in FIG. 6 , after the first piston 20 moves a distance T3 from the initial position P and comes to rest, the piston 60 is in a state of static equilibrium. That is to say, the force exerted by the hydraulic oil in the first chamber 111 on the piston 60 is equal to the force exerted by the hydraulic oil in the second chamber 112 on the piston 60 . The force exerted by the hydraulic oil in the first chamber 111 on the piston 60 acts on the surface of the head 21 of the first piston 20 adjacent to one side of the oil inlet passage 12 and the first end 31 of the second piston 30 adjacent to the surface On the surface of one side of the oil inlet passage 12 , the head 21 of the first piston 20 is adjacent to the surface of one side of the oil inlet passage 12 and the first end 31 of the second piston 30 is adjacent to one side of the oil inlet passage 12 The sum of the surfaces is approximately the square of half the outer diameter D1 of the first end 31 of the second piston 30 times the circumference. On the other hand, the force exerted by the hydraulic oil in the second chamber 112 on the piston 60 acts on the surface of the second end portion 32 of the second piston 30 adjacent to one side of the oil outlet passage 13 . Since the body 22 of the first piston 20 passes through the through groove 33 and is partially located in the second chamber 112 , the actual surface area of the hydraulic oil in the second chamber 112 acting on the piston 60 is about the size of the second piston 30 . The square of half of the outer diameter D2 of the second end portion 32 is multiplied by the pi, and then the square of the half of the outer diameter (ie, the width W6 ) of the body 22 of the first piston 20 is multiplied by the pi.

Under the condition that the force of the hydraulic oil in the first chamber 111 on the piston 60 is equal to the force of the hydraulic oil in the second chamber 112 on the piston 60, the hydraulic oil in the first chamber 111 acts on the piston The surface area of 60 is larger than the surface area of the hydraulic oil in the second chamber 112 acting on the piston 60 , so it can be seen that the hydraulic oil pressure in the first chamber 111 is lower than the hydraulic oil pressure in the second chamber 112 . The ratio of the hydraulic oil pressure in the second chamber 112 to the hydraulic oil pressure in the first chamber 111 is equal to the hydraulic oil in the first chamber 111 acting on the surface area of the piston 60 and the hydraulic pressure in the second chamber 112 The ratio of oil acting on the surface area of piston 60 . For example, the outer diameter D1 of the first end portion 31 of the second piston 30 is about 10 mm, the outer diameter D2 of the second end portion 32 is about 6 mm, and the body of the first piston 20 in the second chamber 112 is located When the outer diameter of the portion 22 is about 3.5 mm, the pressure of the hydraulic oil in the second chamber 112 is about four times or more than the pressure of the hydraulic oil in the first chamber 111, as shown in the following formula.

5x5x3.14/(3x3x3.14-1.75x1.75x3.14)=4.2

It can be seen from this that the outer diameter D1 of the first end portion 31 of the second piston 30 is larger than the outer diameter D2 of the second end portion 32, and the distance pushed by the first piston 20 by the hydraulic oil is greater than the critical distance T to drive the second piston 20. The arrangement of the pistons 30 to move relative to the housing 10 can amplify the pressure of the hydraulic oil flowing out of the oil outlet passage 13, thereby increasing the force of the brake calipers for wheel braking.

After the brake handle is released, the hydraulic oil in the first chamber 111 no longer exerts force on the first piston 20, so the elastic member 50 will push the second piston 30 to reset, and the magnetic attraction of the magnet 40 will make the first piston 20 reset. 20 Return to the initial position P.

Next, please refer to FIG. 7 and FIG. 8 . FIG. 7 is a schematic cross-sectional view of a hydraulic assembly of a bicycle disclosed according to a second embodiment of the present invention. FIG. 8 is a schematic cross-sectional view of the first piston of FIG. 7 when the moving distance is greater than the critical distance.

In this embodiment, the hydraulic assembly 1a of the bicycle is similar to the hydraulic assembly 1 in FIG. 3 , and the difference between the two is that the components for restoring the second piston are different, so only the differences will be described below, and the same or similar parts will be described below. No further description will be given.

In this embodiment, the hydraulic assembly 1a of the bicycle does not include an elastic member, but further includes two magnets 70a, 80a. The two magnets 70a, 80a are located in the first chamber 111a of the housing 10a, the magnet 70a abuts against the first end 31a of the second piston 30a, and the magnet 80a abuts against the first chamber 111a and the second chamber of the housing 10a A section of difference surface 113a between 112a. The two magnets 70a and 80a repel each other to apply a force to the second piston 30a to move toward the oil inlet passage 12a of the housing 10a.

As shown in FIG. 8 , when the distance T4 that the first piston 20a is pushed by the hydraulic oil from the initial position P is greater than the critical distance T, the first piston 20a drives the second piston 30a to move together, and at the same time the first end of the second piston 30a The part 31a also drives the magnet 70a, so that the two magnets 70a and 80a are close to each other. When the hydraulic oil no longer exerts force on the first piston 20a, the repulsive force of the two magnets 70a, 80a will force the magnet 70a to drive the second piston 30a to reset, and the magnetic attraction of the magnet 40a will drive the first piston 20a to reset.

Next, please refer to FIG. 9 , which is a schematic cross-sectional view of a hydraulic assembly of a bicycle disclosed according to a third embodiment of the present invention.

In this embodiment, the hydraulic assembly 1b of the bicycle is similar to the hydraulic assembly 1 in FIG. 3 , so only the differences will be described below, and the same or similar parts will not be repeated.

As shown in FIG. 9, the hydraulic assembly 1b of the bicycle further includes a sealing ring 70b. The material of the seal ring 70b is, for example, rubber. The sealing ring 70b is located in the wide portion 331b of the through groove 33b of the second piston 30b. The body 22b of the first piston 20b passes through the seal ring 70b and is partially located in the narrow portion 332b of the through groove 33b, and the seal ring 70b is located between the head 21b of the first piston 20b and the step surface 333b of the through groove 33b . When the distance that the first piston 20b is pushed by the hydraulic oil from the initial position P is less than a critical distance Tb, the head 21b of the first piston 20b keeps a distance from the sealing ring 70b, so that the oil inlet passage 12b communicates with the first piston 20b through the through groove 33b The two chambers 112b are further communicated with the oil outlet channel 13b.

Next, please refer to FIG. 10 . FIG. 10 is a schematic cross-sectional view of the first piston in FIG. 9 when the moving distance is equal to the critical distance.

When the distance that the first piston 20b is pushed by the hydraulic oil from the initial position P is equal to the critical distance Tb, the sealing ring 70b is clamped between the head 21b of the first piston 20b and the step surface 333b to block the penetration groove 33b, so that The oil inlet passage 12b is not communicated with the second chamber 112b, and further is not communicated with the oil outlet passage 13b.

In this embodiment, the arrangement of the sealing ring 70b can further enhance the effect of blocking the through grooves 33b, so as to ensure that the oil inlet passage 12b and the oil outlet passage 13b are not connected.

Next, please refer to FIG. 11 . FIG. 11 is a three-dimensional schematic diagram of a bicycle braking device disclosed according to a fourth embodiment of the present invention.

In this embodiment, the brake device 100c of the bicycle is used for accommodating a hydraulic oil (not shown). The bicycle brake device 100c includes a brake handle 2c and a hydraulic assembly 1 . The hydraulic assembly 1 is directly disposed on the brake handle 2c. The hydraulic assembly 1 is as described in the foregoing embodiments, so the detailed description of the hydraulic assembly 1 is omitted. The brake handle 2c has an oil outlet hole 3c, and the oil inlet passage 12 of the housing 10 of the hydraulic assembly 1 (as shown in FIG. 3 ) is connected to the oil outlet hole 3c of the brake handle 2c.

In this embodiment, the hydraulic assembly 1 is attached to the outside of the brake handle 2c, but it is not limited thereto. In other embodiments, the housing of the hydraulic assembly may be integrated with the housing of the brake handle, while other components of the hydraulic assembly are disposed within the housing of the brake handle. In addition, the hydraulic assembly may be the hydraulic assembly 1a shown in FIG. 7 or the hydraulic assembly 1b shown in FIG. 9 .

Next, please refer to FIG. 12 . FIG. 12 is a schematic three-dimensional view of a bicycle braking device disclosed according to a fifth embodiment of the present invention.

In this embodiment, the bicycle braking device 100d is used to accommodate a hydraulic oil. The bicycle brake device 100d includes a brake caliper 2d and a hydraulic assembly 1 . The hydraulic assembly 1 is directly installed on the brake caliper 2d. The hydraulic assembly 1 is as described in the foregoing embodiments, so the detailed description of the hydraulic assembly 1 is omitted. The brake caliper 2d has an oil inlet hole 3d, and the oil outlet passage 13 (as shown in FIG. 3 ) of the housing 10 of the hydraulic assembly 1 is communicated with the oil inlet hole 3d of the brake caliper 2d.

In this embodiment, the hydraulic assembly 1 is attached to the outside of the brake caliper 2d, but not limited thereto. In other embodiments, the housing of the hydraulic assembly may be integrated with the housing of the brake caliper, while other components of the hydraulic assembly are disposed within the housing of the brake caliper. In addition, the hydraulic assembly may be the hydraulic assembly 1a shown in FIG. 7 or the hydraulic assembly 1b shown in FIG. 9 .

According to the hydraulic components of the bicycle and the brake device of the bicycle disclosed in the above embodiments, the outer diameter of the first end of the second piston is larger than the outer diameter of the second end, and the distance that the first piston is pushed by the hydraulic oil is larger than The setting of driving the second piston to move relative to the casing after the critical distance can make the pressure of the hydraulic oil flowing out of the oil outlet channel have the effect of amplifying, thus increasing the force of the brake caliper for wheel braking.

Although the present invention is disclosed by the above-mentioned preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the similar arts can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of patent protection of the invention shall be determined by the scope of the patent application attached to this specification.

1, 1a, 1b: hydraulic components 10, 10a: Shell 11: Hydraulic chamber 111, 111a: the first chamber 112, 112a, 112b: the second chamber 113, 113a: level difference surface 12, 12a, 12b: oil inlet channel 13, 13b: oil outlet channel 14: The first shell 15: The second shell 20, 20a, 20b: First piston 21, 21b: head 211: top surface 212: outer ring surface 213: Groove 22, 22b: Body 30, 30a, 30b: Second piston 31, 31a: first end 32: Second end 33, 33b: Grooving 331, 331b: Wide part 332, 332b: Narrow part 333, 333b: Level difference surface 40, 70a, 80a, 40a: Magnets 41: Through hole 50: Elastic 60: Piston 70b: sealing ring 100c, 100d: Brakes 2c: Brake handle 2d: Brake caliper 3c: oil outlet 3d: oil inlet hole W1, W2, W3, W4, W5, W6: Width D1, D2: outer diameter P: location T, Tb, T1, T2, T3, T4: Distance

FIG. 1 is a schematic perspective view of a hydraulic assembly of a bicycle disclosed according to a first embodiment of the present invention. FIG. 2 is an exploded schematic view of FIG. 1 . FIG. 3 is a schematic cross-sectional view of FIG. 1 . FIG. 4 is a schematic cross-sectional view of the first piston of FIG. 1 when the moving distance is less than a critical distance. FIG. 5 is a schematic cross-sectional view of the first piston of FIG. 1 when the moving distance is equal to the critical distance. FIG. 6 is a schematic cross-sectional view of the first piston of FIG. 1 when the moving distance is greater than the critical distance. 7 is a schematic cross-sectional view of a hydraulic assembly of a bicycle disclosed according to a second embodiment of the present invention. FIG. 8 is a schematic cross-sectional view of the first piston of FIG. 7 when the moving distance is greater than the critical distance. 9 is a schematic cross-sectional view of a hydraulic assembly of a bicycle disclosed according to a third embodiment of the present invention. FIG. 10 is a schematic cross-sectional view of the first piston of FIG. 9 when the moving distance is equal to the critical distance. FIG. 11 is a schematic perspective view of a bicycle brake device according to a fourth embodiment of the present invention. 12 is a schematic perspective view of a bicycle braking device disclosed in a fifth embodiment of the present invention.

11: Hydraulic chamber

111: The first chamber

112: Second chamber

12: Oil inlet channel

13: oil outlet channel

14: The first shell

15: The second shell

20: First Piston

21: Head

211: top surface

212: outer ring surface

213: Groove

22: Body

30: Second Piston

31: First end

32: Second end

33: Grooving

331: Wide part

332: Narrow part

40: Magnet

41: Through hole

50: Elastic

W1, W2, W3, W4, W5, W6: Width

D1, D2: outer diameter

Claims (11)

A hydraulic assembly of a bicycle is used for accommodating a hydraulic oil, comprising: a casing having a hydraulic chamber, an oil inlet channel and an oil outlet channel, and the oil inlet channel and the oil outlet channel are connected to the hydraulic chamber; a first piston movably located in the hydraulic chamber; and a second piston movably located in the hydraulic chamber and sleeved on the first piston, and the second piston has an opposite first end and a second end portion, the outer diameter of the first end portion is larger than the outer diameter of the second end portion, and the second end portion is farther from the oil inlet passage than the first end portion; When the distance pushed by the hydraulic oil is less than a critical distance, the second piston is stationary relative to the housing, and the first piston moves relative to the second piston; when the distance pushed by the first piston by the hydraulic oil is greater than the critical distance When the first piston drives the second piston to move relative to the housing together. The hydraulic assembly of the bicycle according to claim 1, wherein the hydraulic chamber has a first chamber and a second chamber connected, the width of the first chamber is greater than the width of the second chamber, the The first chamber is closer to the oil inlet channel than the second chamber, the oil inlet channel and the oil outlet channel are respectively connected to the first chamber and the second chamber, and different parts of the first piston are respectively located in the first chamber. a chamber and the second chamber, the first end and the second end of the second piston are located in the first chamber and the second chamber respectively, the second piston has a through groove, the The second piston is sleeved on the first piston through the through groove; when the distance that the first piston is pushed by the hydraulic oil is less than the critical distance, the oil inlet channel communicates with the first piston through the through groove of the second piston Two chambers; when the distance that the first piston is pushed by the hydraulic oil is equal to a critical distance, the first piston blocks the through groove, so that the oil inlet channel and the second chamber are not communicated. The hydraulic assembly of a bicycle as claimed in claim 2, wherein the through groove of the second piston has a wide portion and a narrow portion connected to each other, the width of the wide portion is greater than the width of the narrow portion, the wide portion and the narrow portion are connected A differential surface is formed between the narrow parts, the wide part is closer to the oil inlet channel than the narrow part, the first piston includes a head part and a body part which are connected, and the width of the head part is smaller than the width of the wide part of the through groove. The width is greater than the width of the narrow part, the body part is smaller than the width of the narrow part of the through groove, and the part of the body part is located in the narrow part; when the distance that the first piston is pushed by the hydraulic oil is less than the critical distance , the head of the first piston keeps a distance from the step surface, so that the oil inlet channel communicates with the second chamber through the through groove; when the first piston is pushed by the hydraulic oil, the distance is equal to the critical distance When , the head of the first piston abuts against the step surface to block the through groove. The hydraulic component of the bicycle as claimed in claim 3, further comprising a magnet, the first piston is made of iron material, the magnet is disposed in the first chamber and is located at the head of the first piston away from the step surface On one side, the magnet is used for applying a magnetic attraction force to the head of the first piston moving away from the step surface. The hydraulic assembly of a bicycle as claimed in claim 4, wherein the magnet has a through hole, the through hole communicates with the oil inlet channel, the first piston has a top surface, an outer ring surface and at least one groove, the top surface Facing the magnet, the outer ring surface is connected to the top surface, the at least one groove extends from the top surface to the outer ring surface; when the first piston is at an initial position, the top surface of the first piston abuts against the magnet, and the oil inlet channel communicates with the wide portion of the through-groove through the through hole of the magnet and the at least one groove of the first piston. The hydraulic component of the bicycle according to claim 2, further comprising two magnets, the two magnets are located in the first chamber, one of the two magnets abuts against the first end of the second piston, the two magnets The other one abuts against a section of the difference surface between the first chamber and the second chamber, and the two magnets repel each other to exert a force for the second piston to move toward the oil inlet passage. The hydraulic component of the bicycle according to claim 2, further comprising an elastic member, the elastic member is located in the first chamber, and the elastic member is used for applying a force to move the second piston toward the oil inlet channel. The hydraulic component of the bicycle as claimed in claim 7, wherein the elastic member is sleeved on the second piston, and opposite ends of the elastic member press against the first end of the second piston and the first end respectively A section of difference surface between the chamber and the second chamber. The hydraulic component of the bicycle according to claim 2, further comprising a sealing ring, the through groove of the second piston has a wide part and a narrow part connected to each other, the width of the wide part is greater than the width of the narrow part, A differential surface is formed between the wide portion and the narrow portion. The wide portion is closer to the oil inlet channel than the narrow portion. The sealing ring is located at the wide portion. The first piston includes a head portion and a body portion. The width of the head is smaller than the width of the wide part of the through groove and larger than the width of the narrow part, the body part is smaller than the width of the narrow part of the through groove, the body part passes through the sealing ring and the part of the body part is located in the narrow part, and the sealing ring is located between the head and the step surface; when the distance that the first piston is pushed by the hydraulic oil is less than the critical distance, the head of the first piston and the sealing ring Keep a distance so that the oil inlet channel communicates with the second chamber through the through groove; when the distance that the first piston is pushed by the hydraulic oil is equal to the critical distance, the sealing ring is clamped to the first piston between the head and the step surface to block the through slot. A bicycle brake device for accommodating a hydraulic oil, comprising: a brake handle with an oil outlet; and a hydraulic assembly, arranged on the brake handle, comprising: a casing with a hydraulic chamber, an inlet an oil channel and an oil outlet channel, the oil inlet channel and the oil outlet channel are connected to the hydraulic chamber, and the oil inlet channel is communicated with the oil outlet hole of the brake handle; a first piston is movably located in the hydraulic chamber a chamber; and a second piston movably located in the hydraulic chamber and sleeved on the first piston, and the second piston has an opposite first end and a second end, the first end The outer diameter of the second end is larger than the outer diameter of the second end, and the second end is farther from the oil inlet channel than the first end; wherein, when the first piston is pushed by the hydraulic oil, the distance is less than a critical distance When the second piston is stationary relative to the housing, and the first piston moves relative to the second piston; when the distance that the first piston is pushed by the hydraulic oil is greater than the critical distance, the first piston drives the second piston The piston moves together relative to the housing. A bicycle brake device for accommodating a hydraulic oil, comprising: a brake caliper with an oil inlet hole; and a hydraulic component arranged on the brake caliper, comprising: a casing with a hydraulic chamber, an inlet an oil channel and an oil outlet channel, the oil inlet channel and the oil outlet channel are connected to the hydraulic chamber, and the oil outlet channel is communicated with the oil inlet hole of the brake caliper; a first piston is movably located in the hydraulic chamber a chamber; and a second piston movably located in the hydraulic chamber and sleeved on the first piston, and the second piston has an opposite first end and a second end, the first end The outer diameter of the second end is larger than the outer diameter of the second end, and the second end is farther from the oil inlet channel than the first end; wherein, when the first piston is pushed by the hydraulic oil, the distance is less than a critical distance When the second piston is stationary relative to the housing, and the first piston moves relative to the second piston; when the distance that the first piston is pushed by the hydraulic oil is greater than the critical distance, the first piston drives the second piston The piston moves together relative to the housing.

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